Improvement in steam-gages



J. R. SEES.

Steam Gage.

Patented' April 26, -1864.

` NrTHn STATES Finca.

PATENT JOHN RANDOLPH SEES, OF NEW YORK, N. Y., ASSIGNOR TO WILLIAM F.

VEAVER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEAM-GAGES.

Specification forming part of Letters Patent No. 42,540, dated April Q6, 1864.

.To all whom t may concern.-

Be it known that I, JOHN RANDOLPH Suns, of the city of New York, in the State of New York, have invented a certain new and useful Improvement on SteamGages or Indicators; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the marks and letters thereon, which said drawings form part of this specication, and show, by-

Figure 1, a front view of the steam-gage having my improvement as a part thereof, and by Fig. 2 a view by vertical central section of such gage.

In both of these figures, where like parts are shown, like marks and letters are used'to indicate the parts.

In a case, a, which is here shown as being of circular form and having for its front b and back c disks of glass, the front one of which is the indicating or dial plate, is fitted the several devices or means that make up this indicator or steam-gage. The steam or air space d has communication with the boiler or other source of initial pressure through the channel e, and by the connecting tube or pipe f. This steam-space d is formed by several cupped disks, y, with central openings, the openings being extended by flanges forming short tubes, the whole beingl firmly united to each other, so as to constitute a continuous chamber or steam space. It will be perceived that the disks are concave, inclinin g toward each other. These concave surfaces will be forced from each other by the pressure of the steam, and as the bottom of the channel to which the chamber is attached is rigid, the expansion due to the pressure will be upward. On the upper closed end of the chamber is a head-piece, lt, in which is pivoted a lever, t', to the long arm of which is connected a rod, j, the lower end of the rod j being connected to a crank, k, on shaft lofthe segment toothed wheel m. Shaft l has its bearings on the side plate of channel e and plate n, plate n being properly secured to the rigid head of the tube and channel plates. On plate a is another short shaft sustaining pinion o, which is in gear with wheel m, and this shaft has on its outer end the indicating finger or arrow p. A spring, q, is coiled around the shaft of the pinion o, one end of the spring being attached to the shaft, and the other end to a little projectingpin, r, of plate a. The tendency of this spring is to incline the indicatingarrow to rest against the arm s. A plate, t, having an arm, u, by a screw, o, is affixed to the solid rim-plate of the gage. This screw c passes through a slot, which is indicated by the cross-lines in Fig. l in the plate t, so that the plate is adjustable, and the arm u may be placed farther from or nearer to the pivoted point ofthe lever, and thus better adapt the gage to high or low pressures.

From this recital of the construction of the gage it will readily be seen that the pressure 'outward of the concave surfaces of the disks and the upward expansion of the steam-chamber will bring the short arm of the lever against the projecting arm above it, elevating the long arm of the lever, `and thus communieating to the indicating-arrow the degree of pressure exerted or existing. As is evident, this gage can be made of any of the materials used in making like gages, as it can also be made in any of the various ways or manners of constructin g gages or indicators.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. Gonstructin g the steam or pressure chamber of the gage of the disks, said steamspace or pressure-chamber being free from solid substances therein, and the lever on the upper end thereof having both of its ends free, the parts being arranged substantially in the manner and operating as herein set forth.

2. The arrangement of the lever t' and the other devices as herein recited, for communieating and indicating the pressure.

3. The plate t and its arm u, for adjusting the gage to high and low pressure.

This specification signed this 30th day of September, 1863.

JOHN RANDOLPH SEES.

Witnesses:

THos. T. EVERETT, J osHPH H. SPRINGER. 

